I've been running blends of ULSD, biodiesel, UVO, jetA and jetB [stale helicopter fuel], kerosene, and petrol for the past 8 years in a late 80s Toyota TDI engine. The mix varies with operating temperature, but at least 50% is ULSD pump diesel. In the summer I use more UVO and less helicopter fuel. The stale chopper fuel is approximated with 25% petrol / 75% kerosene. The UVO is cleaned using cold upflow and the BD,UVO,jetA-B stock-mix is cold filtered at ambient operating temperature through 5µ as it's pumped into the vehicle tank.

Use a simple viscosity test 'cup' to compare the viscosity of your fuel mix with diesel fuel at the same temperature. Drill a 1/8" hole in the bottom of a 1 litre drink bottle. Cut a 1" hole in the side just below the shoulder. Push the test cup into a container of fuel then lift it part way out out so the fuel level is even with the top hole. Then pull it completely out of the fuel and measure the time to empty. Adjust the UVO-petrol mix until the time is the same as with pump diesel.

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